<template>
  <div class="todo-container">
    <div class="todo-wrap">
      <Header :add="add" />
      <List :todos="todos" :del="del" :change="change" />
      <Footer :todos="todos" :setAll="setAll" :delAllData="delAllData" />
    </div>
  </div>
</template>

<script>
import Header from "./components/Header";
import List from "./components/List";
import Footer from "./components/Footer";
export default {
  name: "App",
  // 注册
  components: { Header, Footer, List },
  data() {
    return {
      todos: [],
    };
  },
  methods: {
    // 1.添加数据的方法
    add(newTodo) {
      this.todos.unshift(newTodo);
    },
    // 2.删除数据的方法
    del(id) {
      this.todos = this.todos.filter((item) => item.id !== id);
    },
    // 3.改变勾选框的状态
    change(id) {
      this.todos = this.todos.map((item) =>
        item.id === id ? { ...item, done: !item.done } : item
      );
    },
    // 4.全选的函数方法
    setAll(value) {
      this.todos = this.todos.map((item) => {
        return { ...item, done: value };
      });
    },
    // 5.清楚已完成任务的函数
    delAllData() {
      this.todos = this.todos.filter((item) => !item.done);
    },
  },
  // 监听todos 如果发送改变就将数据发送到本地存储
  watch: {
    todos: {
      // 开启深度监听
      deep: true,
      handler() {
        localStorage.setItem("todos", JSON.stringify(this.todos));
      },
    },
  },
  ///挂载完成后发送请求获取数据
  mounted() {
    this.todos = JSON.parse(localStorage.getItem("todos") || "[]");
  },
};
</script>

<style scoped>
/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}
.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}
</style>